Agromyza polygoni Hering, 1941
on Bistorta
mine
Initially a narrow corridor, that widens into an elongated blotch. Frass at first very fine, later in coarse granules. Often the mines are conspicuously coloured violet red (Buhr, 1964a); they mainly occur in the lower leaves (Hering, 1941a).
hostplants
Polygonaceae, monophagous
Bistorta officinalis.
phenology
Larvae in July (Hering, 1957a).
distribution within Europe
From the Baltic States to France (cf. PESI, 2018).
larva
The larvae are described by de Meijere, as Agromyza sp. (1937a: 174;1938a: 67). Anterior spiraculum with ± 10 papillae.
references
Beiger (1970a), Buhr (1964a), Černý & Merz (2005a, 2007a), Hering (1941a, 1957a), Huber (1969a), de Meijere (1937a, 1938a), Pakalniškis (1995a), Papp & Černý (2015a), Seidel (1957a), von Tschirnhaus (1999a), Winqvist, Černý & Andersen (2020a).